Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large bowl, cream together the softened butter, creamy peanut butter, granulated sugar, and brown sugar until light and fluffy (about 2 minutes).

Beat in the egg and vanilla extract until well combined.

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Roll the dough into 1.5-inch balls, then roll them in granulated sugar. Place them 2 inches apart on the baking sheet.

Use the back of a fork to gently press a criss-cross pattern into the top of each cookie.

Bake for 9-11 minutes until the edges are just starting to brown. The centers will look very soft. Let cool on the pan for 5 minutes before transferring to a wire rack.